There are two ways that I used Numerology & VCV Rack together to create this album. (This was with VCV Rack v.5.1. So before they had the awesome VCV Bridge that makes things a little easier to do now.)

1. Numerology MonoNote to IAC Bus to VCV Rack Midi-1. Then add a bunch of S&H LFOs to modulate the MonoNote. On VCV side, you now can use the MonoNote's midi output to control clock, gate, pitch and so on. You can also use multiple MonoNotes, just have to change the midi channels within the MonoNotes and have an individual Midi-1 in VCV Rack for each channel.

2. Route VCV Rack's audio output to Numerology through Soundflower which then let's you now use all your AU FXs to manipulate the audio even more. With a bunch of LFO modulations on AU FX parameters, you're able to add whole new dimensions to the VCV Rack sounds.

Hopefully all that made some sense. It's a pretty simple setup and hardly touches the possibilities of the combination of these two together. My next thing to try & tackle is the OSC routing from VCV Rack into Numerology.